<template>
  <div :class="{ show: show }" class="header-search">
    <svg-icon class-name="search-icon" icon-class="search" @click="click" />
    <el-select
      ref="headerSearchSelect"
      v-model="search"
      :remote-method="querySearch"
      filterable
      default-first-option
      remote
      placeholder="Search"
      class="header-search-select"
      @change="change"
    >
      <el-option
        v-for="option in options"
        :key="option.item.path"
        :value="option.item"
        :label="option.item.title.join(' > ')"
      />
    </el-select>
  </div>
</template>

<script>
  // fuse is a lightweight fuzzy-search module
  // make search results more in line with expectations
  import Fuse from 'fuse.js/dist/fuse.min.js';

  import { getNormalPath } from '@/utils/ruoyi';
  export default {
    name: 'HeaderSearch',
    data() {
      return {
        search: '',
        options: [],
        searchPool: [],
        show: false,
        fuse: undefined,
      };
    },
    computed: {
      routes() {
        return this.$store.getters.permission_routes;
      },
    },
    watch: {
      routes() {
        this.searchPool = this.generateRoutes(this.routes);
      },
      searchPool(list) {
        this.initFuse(list);
      },
      show(value) {
        if (value) {
          document.body.addEventListener('click', this.close);
        } else {
          document.body.removeEventListener('click', this.close);
        }
      },
    },
    mounted() {
      this.searchPool = this.generateRoutes(this.routes);
    },
    methods: {
      click() {
        this.show = !this.show;
        if (this.show) {
          this.$refs.headerSearchSelect && this.$refs.headerSearchSelect.focus();
        }
      },
      close() {
        this.$refs.headerSearchSelect && this.$refs.headerSearchSelect.blur();
        this.options = [];
        this.show = false;
      },
      change(val) {
        if (this.ishttp(val.path)) {
          // http(s):// 路径新窗口打开
          window.open(val.path, '_blank');
        } else {
          this.$router.push(val.path);
        }
        this.search = '';
        this.options = [];
        this.$nextTick(() => {
          this.show = false;
        });
      },
      initFuse(list) {
        this.fuse = new Fuse(list, {
          shouldSort: true,
          threshold: 0.4,
          location: 0,
          distance: 100,
          maxPatternLength: 32,
          minMatchCharLength: 1,
          keys: [
            {
              name: 'title',
              weight: 0.7,
            },
            {
              name: 'path',
              weight: 0.3,
            },
          ],
        });
      },
      // Filter out the routes that can be displayed in the sidebar
      // And generate the internationalized title
      generateRoutes(routes, basePath = '/', prefixTitle = []) {
        let res = [];

        for (const router of routes) {
          // skip hidden router
          if (router.hidden) {
            continue;
          }
          const p =
            router.path.length > 0 && router.path[0] === '/' ? router.path : '/' + router.path;
          const data = {
            path: !this.ishttp(router.path) ? getNormalPath(basePath + p) : router.path,
            title: [...prefixTitle],
          };

          if (router.meta && router.meta.title) {
            data.title = [...data.title, router.meta.title];

            if (router.redirect !== 'noRedirect') {
              // only push the routes with title
              // special case: need to exclude parent router without redirect
              res.push(data);
            }
          }

          // recursive child routes
          if (router.children) {
            const tempRoutes = this.generateRoutes(router.children, data.path, data.title);
            if (tempRoutes.length >= 1) {
              res = [...res, ...tempRoutes];
            }
          }
        }
        return res;
      },
      querySearch(query) {
        if (query !== '') {
          this.options = this.fuse.search(query);
        } else {
          this.options = [];
        }
      },
      ishttp(url) {
        return url.indexOf('http://') !== -1 || url.indexOf('https://') !== -1;
      },
    },
  };
</script>

<style lang="scss" scoped>
  .header-search {
    font-size: 0 !important;

    .search-icon {
      cursor: pointer;
      font-size: 18px;
      vertical-align: middle;
    }

    .header-search-select {
      font-size: 18px;
      transition: width 0.2s;
      width: 0;
      overflow: hidden;
      background: transparent;
      border-radius: 0;
      display: inline-block;
      vertical-align: middle;

      :v-deep(.el-input__inner) {
        border-radius: 0;
        border: 0;
        padding-left: 0;
        padding-right: 0;
        box-shadow: none !important;
        border-bottom: 1px solid #d9d9d9;
        vertical-align: middle;
      }
    }

    &.show {
      .header-search-select {
        width: 210px;
        margin-left: 10px;
      }
    }
  }
</style>
